The structures of wing-tip vortices at a low Reynolds number ( ##IMG## [http://ej.iop.org/images/1873-7005/52/4/045503/fdrab9b63ieqn1.gif] {$Re_c = 10^3$} ) are studied by direct numerical simulation. After confirming the basic features of the wing-tip vortices, the distributions of axial vorticity and velocity are investigated in detail. The vorticity distribution consists of a dominant symmetric component, quadrupole components responsible for elliptical deformation of the vortex core and the other small components. The symmetric component of vorticity is in reasonable agreement with the Moore-Saffman model (Moore & Saffman 1973 Proc. R. Soc. Lond. 333 , 491) for the three types of wing planform considered: the rectangular, elliptic and delta wings. The agreement between numerical results and the Moore-Saffman model is not good for the symmetric component of axial velocity since the boundary layer component is small owing to the incomplete ...

中文翻译：

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低雷诺数下的翼尖涡旋结构及其建模

雷诺数低时的翼尖涡旋结构（## IMG ## [http://ej.iop.org/images/1873-7005/52/4/045503/fdrab9b63ieqn1.gif] {$ Re_c = 10通过直接数值模拟研究^ 3 $}）。在确认了翼尖涡旋的基本特征之后，详细研究了轴向涡旋和速度的分布。涡度分布由占优势的对称分量，负责涡旋核椭圆变形的四极分量和其他小分量组成。对于考虑的三种类型的机翼平面形状，涡旋的对称分量与Moore-Saffman模型（Moore＆Saffman 1973 Proc.R.Soc.Lond.333，491）在合理的程度上吻合：矩形，椭圆形和三角形的机翼。